Picture-slide-projection apparatus



E. VAN ALTENA.

PICTURE SLIDE PROJECTION APPARATUS.

APPLICA N FILED AUG.26| 1919.

A Patented Sept. 5, 1922.

4 SHEETSSHEET l v [fire/22w C dward Z'a-zz QZZc/La/ i is 130 E. VAN ALTE NA.

PICTURE SLIDE PROJECTION APPARATUS.

APPLICAT ON FILED AUG.25, I919.

Patented Sept. 5, 1922.

4 SHEETSSHEET 2.

grids E. VAN ALTENA.

PICTURE SLIDE PROJECTtON APPARATUS.

APPLICATION FILED AUG-26,1919.

1,428,347. t t d ept i, 1922.

4 SHEETSSHEET 3.

E. VAN ALTENA.

PICTURE SLIDE PROJECTION APPARATUS.

APPLICAT ON FILED AiUG.25. I919.

PatentedSept. 5, 1922. I

4 SHEETSSHEET 4.

Patented Sept. 5, 1922.

EDWARD VAN ALTENA, or NEW YORK, 1w. Y.

PIGTURE-SLIDE-PROJECTION APPARATUS.

Application filed August 26, 1919. Serial No. 320,062.

To all whom it may concern:

Be it known that I, EDWARD VAN ALTENA,

a citizen of the United States, residing at New York, N. Y., have invented new and useful Improvements in Picture-Slide-Projection Apparatus, of which the following is a specification.

This invention relates to improvements in an automatically operated picture-slide display apparatus, wherein a single slide is positioned upon a, display point, and re-,

tained in position until successive slides are brought to the display point to replace the slide so positioned.

An object of this invention is to provide a device of the character described which is provided with adjusting means to assure perfect alignment and perpendicular projection of the light rays upon the display screen, regardless of the angle of the slide when in projecting position.

A further object is to provide an apparatus as described wherein pick-up, feeding and releasing means are provided which are positive in action and operate with a mini-.

- mum amount of wear to the parts.

Another object is to provide, in an apparatus as described, simple means for retaining a slide in an inclined display position whence it is discharged by an overhead tripping action to move, by gravity, tothe magazine section of the apparatus A further object is. to provide, 1n an apparatus as described, positive means for si-' Inultaneously centering and depositing a slide upon the display shelf at the instant of contact therewith.

These objects, as well as others which will i be brought out in the following description and set forth in the appended claims are attained by that embodiment of my invention illustrated in the accompanying drawings, in which,

Figure 1 is a section through a cabinet containing a complete apparatus, and shows a portion broken away, for sake of better illustration; v 4

Figure 2 is aside view of the operatin mechanism removed from the cabinet an shows a slide in place at,the display point and the following slide moving toward that point;

Figure 3 is a top or plan view of the part shown in Figure 2.

Figure 4 is a section taken on line 4-4 of Figures 2 and 3 and looking in the direction indicated by arrow heads;

Figure 5 is an end elevation looking in the same direction; i Figure 6 is a section taken on line 6-6 in Figure 3 and looking in the directionindicated by arrow heads.

Figure 7 is an enlarged detail view and shows the operation of the overhead tripping mechanism to discharge a slide atthe display point and just prior to thetime of release from the feeding chain, of a following slide;

igure 8 is a sectional detail view of the slide centerin element and is taken on the line 8-8 in F igure 7;

Figure 9'is a detail view, in perspective, oi.

Figure 13 is a perspective view of an im-' proved formof plate or slide holder used in i I connection with this machine;

Figure 14 is an enlarged sectional view taken on line 14-14 of Figure 13 and I A Figure 15 is an enlarged sectional view taken on the line 15-I5 of Figure 13.

Referring in detail to the parts; 1 designates a cabinet having an aperture 2 whicharranged with this screen and upon the op:

posite wall. of the cabinet is an adjustably mounted reflecting disk, plate or mirror 4, which disk is horizontally pivoted to therated projecting lip, .6, which engages over the end of a threaded bar, 7, which is in turn wall of the cabinet by the ball hinge joint, 5. s The disk is. furtherprovided with a perfopivotally attached to the wall of the cabinet as it 8i1 b t um nut, 9, en in u n the threaded portion of the b if fl acts t o limit the outward movement of lip, 6, upon the disk, and a spring, '10, normally keeps the lip in its outermost position against the thumb nut. Obviously, a turning movement of the thumbnut will cause the disk to oscillate about its pivotal'connection to 90. v is closed by means of any suitable material v to form a picture screen, 3. concentrically.-

the wall of the cabinet. Set screws, 11, may be employed to lock the disk against accidental displacement;

A frame, 12, is suitably mounted at the base of the cabinet and carries upon it, in

proper angular alignment with the screen and reflecting disk, a projecting lens, 13, which is also in axial ali ment with the inclined display point of t e apparatus, in! dicated by the position of a slide, 14, resting upon inclined ledges, 15, and retained in'pesition' thereon by means of a retaining ledge or shelf, 16.

In axial alignment with the display point and projecting lens is a condensing lens, 17, held in place in close proximity to the display point b which is suita ly mounted between the sides of the frame-any suitable lighting means, as an electric bulb, 19, is suitably positioned and held between the sides of the frame in proper alignment with the condensing lens.

The hereinbefore mentioned inclined ledges, 15, form a part of guideways, 19,

' which are secured to the side of the frame,

and are formed with upper inclined "surfaces, 20, along and upon which the picture slides move and are suspended. The slides are encased in suitable metal bindings, havin projecting arms, 21, formed thereon, w ich act as a means for suspending the slides from the inclined upper surface of the guidewa s.

Endless c ains, 22, are carried about I drums, 23, and over and along channeled runways, 24. The chains engage sprockets 25, mounted upon a shaft, 26, which shaft is in turn rotated, through the medium of the worm, 27, by any suitable driving power, preferably by an electric motor, 28.

These chains are merely representative of any conveying means which may be provided for the slides.

The current supply to the motor is controlled by means of the variable resistance unit, 29, thus providing a means for .con-

trolling the speed of the chain movement.

One or more lifting fingers, 30, may be formed upon the chains and are adapted to contact with the projecting arms formed upon the slides to carry them to the display point. The drums, 23, are suitably formed with channels or grooves, 31, to permit the passage of the finger.

The aforesaid retaining shelf, 16, is seecured to. oscillating arms, 32, which are pivotally connected to the sides of the frame as at 33. A trig er, 34, having an upwardly turned en 35, is secured to one of the oscillating arms in such a manner that it rests normally upon the chain in the channeled runway near the end, 36, of

the same.

means .of a housing, 18',

' Lessee? permit same to clear the guideways and I also act as a stopping means in the downward movement of the retaining shelf.

Having thus described the construction of the device, an explanation of operation thereof follows:

Assuming-that a number of slides have been suspended upon the guideways at the magazine end as clearly shown in the several views and the chains are in operation, the first set of fingers after passing the lower drums en age the projecting arms of the first suspen ed-slide, raises it andcarries it along with it so that. the arms of the slide ride upon the flange of the runway holding the chain,-at the point of engagement with the arms on the slide, in the raised position shown.

This raised portion subsequently 'cOming in contact with the trigger connected with the retaining shelf, lifts it and causes the shelf to swing away from the display point thereby releasing the slide held in the display position. The slide thus released, drops or slides by gravity; the lower edge of the slide moving along the inclined ledges and the upper extending arms of the slide guiding it along the upper inclined surfaces of the, guideways to the magazine section where it moves along step by step until in a position to be again taken up by the fingers on the chains.

Directly after the release of the slide occupying the display position the trigger resumes its normal position,- causingzthe retainingshelf to do likewise, and immediately following this movement the next slide is dropped from the chain in such a manner that it strikes the wedge shaped centering surfaces full and evenly, the wedges acting as a centering and placin means.

The slide so positions remains in place until the next slide comes up. The operation just described is then repeated and continued indefinitely or as long as the chain is in motion.

The interval of display may be determined by the number of fingers upon the chains or by the speed control.

Theadjustment of the reflecting disk, to insure a projection, from an inclined. slide,

perpendicular to the screen, is efiected by permits maintaining the central plane of the projected light reflected from the mirror perpendicular to the screen. The slightest variation of this plane from the perpendicular will distort the image and the operation of the machine will he unsatisfactory. T have found 1189.

in practicethat many circumstances "will act to derange this plane from the perpendicular, due to such things as jarring of the apparatus, its ex ansion and contraction due to heat and so orth, so that this adjustment is a very important part of an apparatus which projects through an inclined 'slide at the display point. Further, by this adjustment, the screen member can be removed and the image thrown upon a screen suspended where desired, for this adjustment will enable the reflected beam to be maintained perpendicular to the screen.

A metal detachable slide holder with no positive connection at any time with any part of the machine, as illustrated in Figures 13, 14 and 15, may be employed in connection with this machine. In this form of holder, a metalframe, having side members, 40, is provided, the frame having-an upper and lower recessed portion, 41 and 42 respectively. To the upper recessed portion departing from the spirit of the same, it will a suspending bar, 43, having extended ends, 44, is attached while a flat depending spring, 45, is secured to the suspendingvbarn The outer free ends of the depending spring engage in the recessed portions 42, and are adapted to engage. against the upper edge of a slide when same is contained in the frame to hold it against dislodgment.

It is ObVlOllS that various modifications may be embodied in this invention without therefore be understood that the claims are not limited to the particular construction shown. As an example, it may bes'tated that the conveying chains and co-acting guides may be omitted and lever arms or wheels used in their place to raise the slides from the reservoir to a point read to drop into the display position. Also t e shelf-could possibly be made stationary if other means were provided to remove a slide therefrom.

All this is within the scope of the appended claims, for I have only illustrated that embodiment of my invention which isthe best form in my estimation. I. la great emphasis upon the various novel eatures, or'their equivalents, brought out in the-claims being operable in' connection with a picture projection apparatus instead of with'a'n apparatus where the picture is reflected or illuminated for the difficulties to be overcome in adapting such feature to a projection apparatus have been well-nigh insuperable.

What is claimed? 1. In combination a plurality of picture slides, a frame having guideways engaged by the upper portions of the slides, the portion of said guideways at the display po nt extending at an inclination to hold the slide in an inclinedv position, a shelf movably mounted at the lower part of said inclined guideways and extendingacross the same to -erated by t up er part of the inclined support the slides singly at the display point,

2.111 combination in a projection appa ratus, a plurality of picture slides, a frame having overhead guideways, inclined guideways for the return of the slides from the display point be inning near the upper end of said overhea guideway, the said slides having projections at their upper ends enter ing said guides to control the movement of the slides and to hang the slides separately in said guideways, elevating means to engage the slides, said elevating means conveying the slides to the display point, a shelf across the inclined guides to hold the slides at the display point, and an overhead trigger actuated means, said shelf being movably mounted to discharge the used slides and being opmeans during the oncoming movement of the new slide, substantially as'described;

3. In combination in a picture projection apparatus, a pluralit of picture slides having projections at t eir up or portions. a frame having inclined gui es for holding e overhead trigger actuated the slides at the display point in inclined position and for returning the slides to their point of storage, a shelf for support ing the slides at the display; point, an overhead trigger actuated means, said shelf being movably mounted and operated by overhead trigger actuated means to 'discharge the new slides and permit the passage of the oncoming new slide. and a track for receiving the lower portion of the discharge slides" while'their upper portions are controlled by the projections thereon moving in the return inclined guides, substantially as described.

4. In combination a plurality of picture slides having projections at their upper por-..

tions, a' frame having overhead guides re-,

ceiving said projections, inclined guide portions at the display point, overhead trigger actuated means return inclined guides, a shelf extending across the guides said shelf holdin the slldes at the dlsplay point and operabe by the overhead trigger actuated means, an elevating chain havin an overhead stretch for conveying the slides to the guide, substantia ly as described.

5. In combination in a picture projection apparatus, a plurality of slides having bent rojections at their upper ends, a frame hav- 1n overhead guideways slidably receiving said projections and for conveying the slides to an inclined position at the dis lay oint, and return incline guides for s idab y directing .the slides to their point ofstorage by gravity, substantially as described.

6.111 combination in a picture slide projection apparatus, a frame having guldewa s to direct the slides to the display point,

sli es having projections at their upper ends moving in said uidew'ays by which the upper ends of t e slides are controlled, guideways for returning the slides to the point of storage, said projections moving in said guideways during the return movement of the slides, means for uidin'g the lower portions of the slides in t eir returning movement, a shelf for holding the slides at thedisplay point, and an overhead trigger actuated means, said shelf being movable and operable by the overhead trigger ac tuated meansto discharge the used slide and permit the new slide to pass above it, sub-' stantially as described.

7; In combination in a picture slide projection apparatus, a frame having guideways to direct the slides to'the display point,'-

slides having projections at their upper ends moving in said guideways by which the upper ends of t e slides are controlled, guldewa s for returning the slides to the point 0 storage, said projections moving in said guidew-ays during the return moveguideways for directing ment of the slides, means for guiding the lower portions of the slides in their returning movement a shelf for holding the slides, at the display point, and an overhead trigger actuated means, said shelf be-.

ing mova le and operable by the overhead tr1 ger actuated means to discharge the used sli e and permit the new slide to pass above it, and means for operatively engaging the said trigger actuating means, substantially as described.

8. In a picture slide projection apparatus,

slides havlng projecting arms at them upperends, a frame having overhead guideways receiving sald proectlons, return inclined magazine oint, conveying means for conveying sli es to the display oint along the overhead guideways, a re easing means operable in the overhead guide to deposit slides at the dis lay point, and a centering means forme at and'upon the display .oted supporting means.

the slides to the point to receive the slide and act upon it after its release from the guideway.

.9; In a picture slide projemion apparatus, a frame having guideways to, direct slides' to the display point, means for conveying the slides to the display point, means forretaining the slides at the display point, means for releasing the slides from the convey1 where y they drop onto the retaining means,

means when above the displaypoint and means for simultaneously centering the I slides as they drop to the display point.

10. A projection apparatus 0 slides having a magazine, a slide point, means for supporting a slide at its bottomat the displa point, conveying means fo'r'carrying a zine toa point above display position of a slide, and'a trigger means for displacing a slide from its-support at the dis lay point operated by a slide carried by t e conveying means.

11. A projection apparatus for picture slides having a magaz1ne,a slide display point, means for supporting a slide at its bottom at the display oint, conveying means for carrying a sli e from the rear of the magazine up and toward a point above ide from the ma a- 'r icture isplay dis lay posltion of a slide, and means asfrom the pivaway from displa point, said shelf being" adapted to stradd e said guides.

In testimony whereof, I have signed my name to this specification, this 20th day of August, 1919. EDWARD VAN ALTENA.

. Witness:

JOHN T. Coasters;- 

